[PULL 02/11] block/dirty-bitmap: add bdrv_has_named_bitmaps helper

[Eric Blake <eblake@redhat.com>]

From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

To be used for bitmap migration in further commit.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200521220648.3255-3-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
---
 include/block/dirty-bitmap.h |  1 +
 block/dirty-bitmap.c         | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index 5a8d52e4deaf..36e8da4fc2e3 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -95,6 +95,7 @@ int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap);
 void bdrv_dirty_bitmap_truncate(BlockDriverState *bs, int64_t bytes);
 bool bdrv_dirty_bitmap_readonly(const BdrvDirtyBitmap *bitmap);
 bool bdrv_has_readonly_bitmaps(BlockDriverState *bs);
+bool bdrv_has_named_bitmaps(BlockDriverState *bs);
 bool bdrv_dirty_bitmap_get_autoload(const BdrvDirtyBitmap *bitmap);
 bool bdrv_dirty_bitmap_get_persistence(BdrvDirtyBitmap *bitmap);
 bool bdrv_dirty_bitmap_inconsistent(const BdrvDirtyBitmap *bitmap);
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index f9bfc77985e8..c01319b188c3 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -818,6 +818,19 @@ bool bdrv_has_readonly_bitmaps(BlockDriverState *bs)
     return false;
 }

+bool bdrv_has_named_bitmaps(BlockDriverState *bs)
+{
+    BdrvDirtyBitmap *bm;
+
+    QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) {
+        if (bdrv_dirty_bitmap_name(bm)) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
 /* Called with BQL taken. */
 void bdrv_dirty_bitmap_set_persistence(BdrvDirtyBitmap *bitmap, bool persistent)
 {
-- 
2.26.2